Filter



F. FESSLER March 19, 1957 FILTER Filed April 29. 1952 INVENTOR. @fan/ ,s'g/ef AGT FILTER Frank Fesslr, Newark, N. J.

Application April 29, 1952, serial No. 284,952 2 claims. (c1. 13u-1o) 'This invention relatesrto a iilter,imor'e particularly to a filter cigarette, the present application being a continutioninpart of my application Serial No. 167,302, tiled June 10, 1950, and entitled Tobacco Smokers Article, now Patent #2,762,375, issued September 11, 1956.

In view of the large consumption of tobacco products, 'especially with the spread of consumption of smoking tobacco products during the last decades, many efforts have beenmade to lessen the harmful effects of smoking by purifying tobaccos or tobacco smoke; However, none fthe known attemptsv seems to have proven entirely satisfactory.

Among the actual developments to reduce the irritating eiects of tobacco smoke, absorbent filters provided in cigarettes became popular. My invention is concerned with such a filter, and the primary object of the invention is to generally improve the known lters.

rWhile the known iilters retain nicotine and irritating tarry substances ofthe smoke, they are not effective enough in their retaining action. A more specific object ofmy invention is, therefore, to increase the effectiveness of the known filters. i

One of the actions that take place when tobacco smoke isdrawn through a cigarette is condensation. Tobacco smokev contains noncondensable gases and condensable vapor, the latterbeing converted intoV a liquid and/or semisolid state when cooled. VIn order to convert such vapors into liquids or semisolid-s which can be separated from the non-condensable gases, the temperature of the smoke has to be lowered suiiiciently.Y Thus, my present invention has for one of its objects to provide cigarettes with lter means which will further the condensation of the condensable constituents of tobacco smoke.

It is known that a low temperature of tobacco. smoke will in general furnish a less irritating and a more enjoyable smoke. provide perforated metal inserts in tobacco pipes to cool the smoke, but so far it was impossible to introduce in cigarettes inserts of good heatconducting properties. An important object of my invention is to provide etlicient heat-conducting inserts in cigarettes.

A copending application of mine, Serial Number 284,- 951, deals with metal inserts in cigarettes or cigars laid across the path of the tobacco smoke drawn through a cigarette or cigar. Being good heat conductors, these metal inserts contribute to the lowering of the temperature of the tobacco smoke, improving the quality of the lter to retain liqueable matter to be deposited, and thus considerably reducing obnoxious compounds in the tobacco smoke. The present `invention is concerned .with metal inserts of a dilerent construction for cooling`v the stream of tobacco smoke drawn through cigarettes.

My invention is concerned with the combined use of inserts or condensers of the kind referred to and of filter- Y ing material. One object of my invention is to provide Also, it has already been suggested toV United States Patent l ice To the accomplishment of `the foregoing and other objects which will appear hereinafter, my invention consists of a lter cigarette, the elements thereof, and the relation of the elements one to the other, as, are more particularly described in the specification `and sought to be defined in the claims.

The specification is accompanied by :a drawing in which: Y

Fig. 1 is a fragmentary partially sectioned elevation of a cigarette embodying features of my invention, the cigarette being schematically illustrated to enlarged scale;

Fig. 2 is a fragmentary end view, schematically shown, of the mouth end-of the cigarette of Fig. 1, the outside wrapper being removed;

Fig. 3 is a perspective view of a plugl-ike condenserilter Yas used, for instance, in'the cigarette of Fig. 1, the plug forming a coil and being schematically shown partially unrolled;

Fig. 4 is an enlarged, expanded, partial cross-sectional view of a condenser-filter;

Figs. 5 and 6 are perspective views of two modifications of a filter device in coil form, the coils being again schematically lshown partially unrolled;

Fig. 7 is a fragmentary longitudinal section taken through the condenser-lter of Fig. 5;

Fig. 8 is a longitudinal section through two contiguous layers of the condenser-filter of Figs. 5 and 7; t

Fig. 9 is a vertical Vsection through a portion of on form of filter constructed in accordance with the invention;

Fig. 10 is a fragmentary longitudinal section through ai further modification of a condenser-filter; Y

Fig. ll is a longitudinal section Aof a single crepe paper layerof the device of Fig. 10 with a contiguous layer of metal foil on each side; p,

Fig. 12 illustrates one more modification of my condenser-filter;

Fig. 13 is a plan view of a blank of crepe paper having a'strip of metal foil superposed upon it;

Fig. 14 is a perspective view of a coiled plug formed from the structure Vof Fig. 13, the plug illustrating a further modilcation of my filter-condenser and being again schematically shown partially unwound; and

Fig. 15 is a View similar to that of Fig. l, butshovvinga different cigarette construction. ,Y Y

Referring to the drawing in 'greater detail and having rst reference to Fig. 1, in a cigarette designated 10, a wrapper 12 encloses a roll 14 of tobacco, and a wrapper 16 encloses a'tobacco fume-condensing and deposit-co1- lecting plug 18. A wrapper 2i) joins the tobacco'section and condenser-filter section. Fig. 2 illustrates one way of forming the plug 18. According to Fig. 2, the plug is formed by rolling two superposed ribbons vof crepe paper 22 and metal foil 24, respectively, upon themselves. In the coiled condition which is shown in Figs. 2 and 3, the outermost winding is metal foilrand is lin thermal contact with the wrapper 16. The convolutions of the ribbons form longitudinally disposed channels for the tobacco smoke, the channels being defined both by crepe paper and metal foil surfaces. The ribbons are closely wound so that the channels formed will constitute narrow passages and will ensure the most favorable conditions for transmission of heat from the ow'of smoke to the metal foil. The liquids and/or semisolids obtained by condensation in part caused by the metal foil, are suspended in the tobacco smoke stream in form of mists or fumes and coalesce into drops which deposit on the crepe paper.

In Fig. 4, the roll is formed by the crepe paper coil 22a and the metal foil coil 24a. The two coils form a multitude of generally longitudinally extending relatively re-` stricted passages. The stream of tobacco smoke, while Ybeing cooled upon contact with the metalpasses through both the crepe paper'an'd the passages, and condensed matterisdepos'ited in and on the crepe paper.

The condenser-filter shown in Fig. 5 is formed by coil- Y ing. a ribbonA of crepe paper 26 .anda ribbonof metal foil 28, thejlatter ribbon. having ftheY Asame length ,aslhe i former but being of a -narrower width. Theicigarette smoke Y'lowsV through therpassages. between thelconvolutions of crepe paper `and metalfiioilf:andsthroughfthe crepe paper.r Y

The condenser-ilterY of vEig.A 6in similar to'ihat oilig. 5 except that there arerttwol crepe paper ribbons 25aand two metal 4foilribbons 28aalternately coiled, and that-Qthe metal foil coilstare notlosebetween thetcrepespaper coils.

paperV and. metal -foil cfoilssjs shown, :sasl itappearsy the plug f Figi 5. There Yis a metaloil winding between V every two crepe paper windingsgandthe winding isarranged sothat the Qutermostlayer willfbevmetallfoil..

' T o increasefthe lteringaction of the condenser-filter of Figs. 5, 7 a11`1d'8, I provi'delayers' 30 of ltering material las shown in Fig. 9. to iill the empty. spaces between adjacentrcoils2617 of crepe paper. .The crepe paperlayers 26b correspond torthecrepespaper. convolutionsl. in Fig. Sand Vto thevcrepe paper layersr26 inV Figs. 7, and 8, and'the layer 28b `of metalefoil `c orrespondstothe metal foilv convolutions 2S in Fig. Sand to themetal foilY layers 28 in Figs. 7 andl 8.

In the embodiment of Figs. 10Y ancbll, the .plug-isA formed-by. coiling 'a sheetror ribbon`32 of crepe paperand two narrow ribbons 34 of metalfoiL'the lattertwo ribbons beingv superposed on the oppositeV faces, aridfex-Y tending along the opposing longitudinal edges, ofthe Y crepe paper. .The emptyrspaces between adjacent coil'sg32 shown in Fig. 10, may be lled kwith iltering material.

In Fig. 12, one of ,theV coils-32 QfIFiglO yis identiedV by Ythe referencercharacter 32a,.the filtering matenaltolll the empty spaces between thecoils 32a -being designated 36 'Where ltering material is used to'll such vempty spaces asrshown in Figs. 7 and 10pu1p, for instance, may s -easily be applied toV -thesupp'orting layer26 of Eig. Tand` Figs. 10 and 32, respectively. V'The condenserflter plugs of Figs.s7 to 12 allow the cigarette .smoke to pass through thev spaces between Y the windings,V Y or forcethe; smoke 'toowth'ough lteling material.

Figs. 13 anddztrelateto-a condensertlter'which-is' formed by rolling up'a blankS 'of crepe paper. having a strip 40 of metal Vfoil diagonally'superposed uponlit, y Y

Referring now to Fig. 15a wrapper 42 encloses both a rll V44 f tbbacco and a cylinder 46 formed by rolling a strip of cardboard or th like on itself.V The cylinder 46 receives a condenser-filter plug 48j With the mouth end of the cigarette tube 42 being empty, the cylinder Vcan be lsuiiiciently compressed to allow its introduction. Y It is.held in place within thepaper tube by its expansion after insertion. n Y

It will be clear that :wherever crepe paper has been referred to, other ltering'rnaterial may be used as well, Y

for instance, layers f-pulp, cotton,oras'bestos, shavings of soft absorbent-wood, husks; orleayes.

It wil1`be apparent`that' while I have shown and described my invention in-.a numberfoffforms, many changes and modicationsmayY be made without departing from Y thefspin't of theinvention defined in the Yfollowing claims. I claim:

lfAvlter,comprisinglayerssouniformestrips tnssnias ferial.V in spaced'relation and apluralityfofstripsfomateg rial which "differs fromftheifmaterialof saidY layers Y1arranged in mutual 1 edgeetofedge,relationsbetween "the said strips, `the secondV pluralityof: strips havingv acombined width corresponding to. the,` width of 'theilayersof strips,

the combined strips being coiled'tofform aroll.

"2. A`lter for ciagrettes comprising a concentricrollbf t at least two superposed strips,orieffs'aidstrips` beingfabf sorbent material, Athe others'trip' being Vmet'aL-.fiL .the str ipof metalffoil. being narrowenthanltlievstrip 'of-.ab f

' sorbentmateral, Yand added absorbent materiaL arranged.

inmutual edgeV-to-edge relation. tothe; metal foilastrip.V jr' *i References' Ctedirftherle'of this Vpatent srATEsrATENTs., w 

